Python에서 AttributeError: 'numpy.ndarray' 객체에 'Append' 속성이 없음 수정

import numpy as np

arr = np.array([[1, 2, 3], [4, 5, 6]])
print(f"Type: {type(arr)}")
print(f"Dimension: {arr.ndim}")
print(f"Shape: {arr.shape}")
print(f"Element data type: {arr.dtype}")

Type: <class 'numpy.ndarray'>
Dimension: 2
Shape: (2, 3)
Element data type: int32

>>> arr.append([1,2])
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'numpy.ndarray' object has no attribute 'append'

import numpy as np

arr = np.array([[1, 2, 3], [4, 5, 6]])
arr = np.append(arr, [[7, 8, 9]], axis=0)
print(arr)

[[1 2 3]
 [4 5 6]
 [7 8 9]]

import numpy as np

arr = np.array([[1, 2, 3], [4, 5, 6]])
arr = np.append(arr, [[7, 8, 9]])
print(arr)

[1 2 3 4 5 6 7 8 9]

import numpy as np

arr = np.array([[1, 2, 3], [4, 5, 6]])
arr = np.append(arr, [[7, 8]], axis=0)

ValueError: all the input array dimensions for the concatenation axis must match exactly, but along dimension 1, the array at index 0 has size 3 and the array at index 1 has a size 2